* assert torch!=1.12.0 for DDP training

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Raise error on invalid model

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Improved error reporting for https://github.com/ultralytics/yolov5/issues/8519

Properly expose `batch_size` from OpenVINO
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Avoid FP64 ops for MPS support

Resolves https://github.com/ultralytics/yolov5/pull/7878#issuecomment-1177952614

Revert "Expose OpenVINO `batch_size` similarly to TensorRT (#8437)"

This reverts commit da2ee393.

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Exclude torch==1.12.0, torchvision==0.13.0

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Require explicit request for MPS, i.e.
```bash
python detect.py --device mps
```

Reverts https://github.com/ultralytics/yolov5/pull/8210 for preferring MPS if available. 

Note that torch MPS is experiencing ongoing compatibility issues in https://github.com/pytorch/pytorch/issues/77886

* TRT `--half` fix autocast images to FP16

Resolves bug raised in https://github.com/ultralytics/yolov5/issues/7822

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* Implementation of Early Stopping for DDP training

This edit correctly uses the broadcast_object_list() function to send slave processes a boolean so to end the training phase if the variable is True, thus allowing the master process to destroy the process group and terminate.

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* Fix ONNX `--dynamic` export on GPU

Patch forces --dynamic export model and image to CPU. Resolves bug raised in https://github.com/ultralytics/yolov5/issues/8377

* Update export.py

Updates the requirements on [protobuf](https://github.com/protocolbuffers/protobuf) to permit the latest version.
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---
updated-dependencies:
- dependency-name: protobuf
  dependency-type: direct:production
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